It can happen, and you don't want it since the reflector is very very fragile and corrosion will ruin it.

YOu should be able to disassemble it and seal with silicone. Of course you don't want that on your bulb.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.